Aikido is the only martial art allowed in the U.S. federal prison system.

In a recent Florida court case, a man resisting arrest charged the officer involved for using excessive force when his wrist was broken during the application of an Aikido technique. The case reached the Florida State Supreme Court which ruled that the offender broke his own wrist by resisting the technique.

Morihei Ueshiba, founder of Aikido, once pinned a Sumo wrestler using only a single finger.

The practice of Shikko (or "knee-walking"), which has become an integral part of Aikido training, was originally developed when Japanese feudal lords required that all their followers remain on their knees while in the lord's presence. It later developed into a formal movement in many samurai ceremonies.